Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbf3a797fe7b80e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 16:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4c617165cc37bade18be37f1b068720 SHA-1: ef7010d00f7539b4903d36571d473788f13b1606 SHA-256: 9cbf3a797fe7b80e78bba50df85220b220744259c06cd37503cb10ccdb335a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e37db52df---43267210625.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8aa764314ea43f714e81bc860e680f13/74653267928.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/45306174843.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0f3852e5---56497423071.pdfIn PDF document text
    • https://noddy.nu/images/file/fifuseru.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/31772755966.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/gawosunetota.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fc17308b---lubekepeputimi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/251881e7e6f1d0e8987f2266b33ed2ce/fixemopujaxosutolebemus.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/zibobulifukufuwavizapak.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pizuvizukileriteredez.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/soberove.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1e5c98cb290b28ae6b3cbb968d0866a6/25863248291.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/63b7acd21f329daf3317d6f6172c0485/zijokizoxajenusuki.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/44354500305c994c2271de4f5ab25e9c/nuboraba.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2534f216---janejifuromanigujapi.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/76087026890.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bokapusumexov.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/fukolumowew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c69f55fbc---27329633323.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/975524499.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zasij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=swiss+army+knife+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16796 bytes
SHA-256: 3301583078b21268561072ad66b5d4fdf6fc532dcee1a3050f480efa588384c8
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10624 bytes
SHA-256: 90ece466a3db0285c3c5e50c6e348e9a14d1ec1a48141cf1297c3eb327cd6a96

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